Those who are of a realism-challenged disposition will of course argue that we never die and that somehow our "essence" turns into some sort of meaningful vapour that travels millions of light years away into some other universe.
In the year 1901 a Dr. Duncan MacDougal came up with the "21 Gram" theory whereby he investigated the loss of weight of patients shortly after death and intimating that the soul has some sort of physical substance to it.
Delving further back into the annals of scientific research we find that during the French Revolution a Dr. Seguret would slip a few extra francs to condemned prisoners about to be decapitated for them to wink an eye afterwards to signify that they were conscious and could feel pain. Apparently, some of the hapless victims did just that.
Then there is the endless debate as to whether one is expired by being "brain dead" or "heart dead". So, at what point do we actually die?
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